Brand new unit on maiden voyage. Go walking around left front corner and notice water dripping.(right below washer and dryer). Wife sees that gray tank is full, so I pull valve and drain. Later she is taking shower and water won't drain. Worked fine the previous two days. Unscrew metal drain plate to look down and see some sort of silicone/clear rubber item. Not sure if that is some sort of anti siphon or what......any thoughts?

It's called a HepvO valve ... it's used in RV's that have a limited space under the shower instead of a regular P-Trap. You have to be really careful sticking something down them if you think you have a clog. If you can get under your shower, it just uncouples from between the drain and piping to the tank. I've never had one apart, but new ones aren't that expensive.

Diesel guy, thanks for the reply! Had done some checking and found out the info on the hepo valve. Went under and disconnected the valve. Pushed the valve back into its right position and re-installed. No leaks. Appears when the level came up from full gray tank, it caused the valve to flip in the wrong direction causing the tub not to drain properly. Dumped 5 gallon bucket down the drain with no issues. Thanks again!